System and Method for Identifying a Subscriber in a Network Environment

1. A method for a communication network comprising: receiving, by a first Home eNodeB (HeNB), a first attach request from a user equipment (UE) for attaching a subscriber associated with the UE to a small cell network; determining whether the subscriber has transitioned into the small cell network from a macro cell network; exchanging, based on the determination, a first pair of messages between the first HeNB and the UE to determine an International Mobile Subscriber Identity (IMSI) of the subscriber; exchanging, based on the determination, one or more second pairs of messages between the first HeNB and the UE to advance a sequence number for Non-Access Stratum (NAS) messages for the UE to a value corresponding to a received sequence number for the first attach request from the UE; receiving, by a second HeNB, a second attach request from the UE for attaching the subscriber to the small cell network; determining whether the subscriber has transitioned to the second HeNB from another HeNB in the small cell network; and retrieving, by a Home eNodeB gateway (HeNB-GW), the IMSI of the subscriber by recovering an association of the IMSI with a Globally Unique Mobility Management Entity Identity (GUMMEI) and a Mobility Management Entity UE S1AP Identity (MME UE S1AP ID) for the subscriber if the subscriber has transitioned to the second HeNB from another HeNB in the small cell network.

2. The method of claim 1 , wherein the first pair of messages and the one or more second pairs of messages include: an Evolved Packet System Mobility Management Identity (EMM-ID) Request message; and an EMM-ID Response message.

3. The method of claim 1 , wherein the determining that the subscriber has transitioned into the small cell network from the macro cell network includes determining that a source tracking area identity (TAI) for the subscriber does not match a corresponding TAI provisioned for the first HeNB.

4. The method of claim 1 , wherein the first HeNB is provisioned, at least in part, to provide resources for a closed subscriber group (CSG), the method further comprising determining whether the subscriber is a member of the CSG by performing at least one of: querying a service with the IMSI of the subscriber and an identifier for the CSG to determine if the subscriber is a member of the CSG; querying a service with the IMSI of the subscriber and an identifier for the first HeNB to determine if the subscriber is a member of the CSG; and comparing the IMSI of the subscriber to a list of authorized subscribers for the CSG; and communicating to the first HeNB whether the subscriber is a member of the CSG to provide resources to the subscriber, wherein the resources provided to the subscriber can be adjusted based on an access mode of the first HeNB and whether the subscriber is a member of the CSG.

5. The method of claim 4 , further comprising: associating the IMSI of the subscriber with a Globally Unique Mobility Management Entity Identity (GUMMEI) and a Mobility Management Entity UE S1AP Identity (MME UE S1AP ID) for the subscriber if the subscriber is a member of the CSG; and storing the association of the IMSI in combination with an identifier for the CSG.

6. The method of claim 1 , wherein the determining that the subscriber has transitioned to the second HeNB from another HeNB in the small cell network includes matching a source tracking area identity (TAI) for the subscriber to a corresponding TAI provisioned for the small cell network.

7. The method of claim 1 , wherein the second HeNB is provisioned, at least in part, to provide resources for a closed subscriber group (CSG), the method further comprising: determining whether the subscriber is a member of the CSG by performing at least one of: querying a service with the IMSI of the subscriber and an identifier for the CSG to determine if the subscriber is a member of the CSG; querying a service with the IMSI of the subscriber and an identifier for the second HeNB to determine if the subscriber is a member of the CSG; and comparing the IMSI of the subscriber to a list of authorized subscribers for the CSG to determine if the subscriber is a member of the CSG; and communicating to the second HeNB whether the subscriber is a member of the CSG to provide resources to the subscriber, wherein the resources provided to the subscriber can be adjusted based on an access mode of the second HeNB and whether the subscriber is a member of the CSG.

8. The method of claim 7 , wherein the association of the IMSI with the GUMMEI and the MME UE S1AP ID includes an association with an identifier for the CSG.

9. One or more non-transitory tangible media encoding logic that include instructions for execution that, when executed by a processor, is operable to perform operations comprising: receiving, by a first Home eNodeB (HeNB), a first attach request from a user equipment (UE) for attaching a subscriber associated with the UE to a small cell network; determining whether the subscriber has transitioned into the small cell network from a macro cell network; exchanging, based on the determination, a first pair of messages between the first HeNB and the UE to determine an International Mobile Subscriber Identity (IMSI) of the subscriber; exchanging, based on the determination, one or more second pairs of messages between the first HeNB and the UE to advance a sequence number for Non-Access Stratum (NAS) messages for the UE to a value corresponding to a received sequence number for the first attach request from the UE; receiving, by a second HeNB, a second attach request from the UE for attaching the subscriber to the small cell network; determining whether the subscriber has transitioned to the second HeNB from another HeNB in the small cell network; and retrieving, by a Home eNodeB gateway (HeNB-GW), the IMSI of the subscriber by recovering an association of the IMSI with a Globally Unique Mobility Management Entity Identity (GUMMEI) and a Mobility Management Entity UE S1AP Identity (MME UE S1AP ID) for the subscriber if the subscriber has transitioned to the second HeNB from another HeNB in the small cell network.

10. The media of claim 9 , wherein the first pair of messages and the one or more second pairs of messages include: an Evolved Packet System Mobility Management Identity (EMM-ID) Request message; and an EMM-ID Response message.

11. The media of claim 9 , wherein the determining that the subscriber has transitioned into the small cell network from the macro cell network includes determining that a source tracking area identity (TAI) for the subscriber does not match a corresponding TAI provisioned for the first HeNB.

12. The media of claim 9 , wherein the first HeNB is provisioned, at least in part, to provide resources for a closed subscriber group (CSG) and wherein the operations further comprise: determining whether the subscriber is a member of the CSG by performing at least one of: querying a service with the IMSI of the subscriber and an identifier for the CSG to determine if the subscriber is a member of the CSG; querying a service with the IMSI of the subscriber and an identifier for the first HeNB to determine if the subscriber is a member of the CSG; and comparing the IMSI of the subscriber to a list of authorized subscribers for the CSG; and communicating to the first HeNB whether the subscriber is a member of the CSG to provide resources to the subscriber, wherein the resources provided to the subscriber can be adjusted based on an access mode of the first HeNB and whether the subscriber is a member of the CSG.

13. The media of claim 12 , wherein the operations further comprise: associating the IMSI of the subscriber with a Globally Unique Mobility Management Entity Identity (GUMMEI) and a Mobility Management Entity UE S1AP Identity (MME UE S1AP ID) for the subscriber if the subscriber is a member of the CSG; and storing the association of the IMSI in combination with an identifier for the CSG.

14. The media of claim 9 , wherein the determining that the subscriber has transitioned to the second HeNB from another HeNB in the small cell network includes matching a source tracking area identity (TAI) for the subscriber to a corresponding TAI provisioned for the small cell network.

15. An apparatus, comprising: a first Home eNode B (HeNB); a memory element for storing data; and a processor that executes instructions associated with the data, wherein the processor and memory element cooperate such that the apparatus is configured for: receiving a first attach request from a user equipment (UE) for attaching a subscriber associated with the UE to a small cell network; determining whether the subscriber has transitioned into the small cell network from a macro cell network; exchanging, based on the determination, a first pair of messages between the first HeNB and the UE to determine an International Mobile Subscriber Identity (IMSI) of the subscriber; exchanging, based on the determination, one or more second pairs of messages between the first HeNB and the UE to advance a sequence number for Non-Access Stratum (NAS) messages for the UE to a value corresponding to a received sequence number for the first attach request from the UE; receiving, by a second HeNB, a second attach request from the UE for attaching the subscriber to the small cell network; determining whether the subscriber has transitioned to the second HeNB from another HeNB in the small cell network; and retrieving, by a Home eNodeB gateway (HeNB-GW), the IMSI of the subscriber by recovering an association of the IMSI with a Globally Unique Mobility Management Entity Identity (GUMMEI) and a Mobility Management Entity UE S1AP Identity (MME UE S1AP ID) for the subscriber if the subscriber has transitioned to the second HeNB from another HeNB in the small cell network.

16. The apparatus of claim 15 , wherein the first pair of messages and the one or more second pairs of messages include: an Evolved Packet System Mobility Management Identity (EMM-ID) Request message; and an EMM-ID Response message.

17. The apparatus of claim 15 , wherein the determining that the subscriber has transitioned into the small cell network from the macro cell network includes determining that a source tracking area identity (TAI) for the subscriber does not match a corresponding TAI provisioned for the first HeNB.

18. The apparatus of claim 15 , wherein the first HeNB is provisioned, at least in part, to provide resources for a closed subscriber group (CSG), the apparatus being further configured for: determining whether the subscriber is a member of the CSG by performing at least one of: querying a service with the IMSI of the subscriber and an identifier for the CSG to determine if the subscriber is a member of the CSG; querying a service with the IMSI of the subscriber and an identifier for the first HeNB to determine if the subscriber is a member of the CSG; and comparing the IMSI of the subscriber to a list of authorized subscribers for the CSG; and communicating to the first HeNB whether the subscriber is a member of the CSG to provide resources to the subscriber, wherein the resources provided to the subscriber can be adjusted based on an access mode of the first HeNB and whether the subscriber is a member of the CSG.